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Industry group American Petroleum Institute (API) estimated a draw of around four times the 1.7 million barrels seen in a Reuters poll of five analysts. "Since we expect further drops in the inventory figure, we expect some upward movements ahead," said Singapore-based Phillip Futures said on Wednesday.

On the demand side, the EIA raised its 2015 world oil demand growth forecast by 20,000 barrels per day to 1.25 million bpd.

Despite the rallies this week, analysts said that big further gains were unlikely due to continued oversupply. "With US production still around record levels, Opec keeping its output quota unchanged at 30 million barrels per day and indications that Opec members may even increase its production, the situation of oversupply will remain longer than expected. This, combined with our forecast for a stronger US dollar, will keep downside risks alive," ABN Amro said in its June monthly commodity update.

Saudi Arabia, the world's top crude exporter, will supply full contracted volumes of crude oil to at least two Asian term buyers in July, unchanged from June, following Opec's decision to maintain its production target, industry sources familiar with the matter said on Wednesday.

The Opec kingpin has supplied full contractual volumes to most Asian buyers since late 2009, implying that the Saudis still want to defend market share via high volumes rather than prop up prices through supply cuts.